FAQ

All Platforms

My playback is too slow. How can I improve it?

Check that you have:
- Window->Preferences
  - OpenGL
    
    Color Buffers’ Accuracy set to Automatic (preferred) or Fast.
  - Thumbnails
    
    Preview Thumbnails Above Timeline off.
  - Playback
    
    Auto Hide Pixel Bar checked or optionally hide the pixel bar or set the UI to presentation mode.
- Panel->Settings
  - Cache Gigabytes
    
    Set to 4GB at least (the default is half your memory)
  - FFmpeg Color Precision
    
    If you are playing a YUV420_P8 video with Color Space “undefined” this setting will provide a more accurate color conversion, but it can make the reading of the movie slow.

Linux

All protocols

Playback of screen captures don’t play at their actual speed.

Sadly, this is a limitation of mrv2. Screen captures such as those created by Ubuntu may rely on Variable Frame Rates (VFR), meaning that the speed changes between each frame of the video. mrv2 needs a constant frame rate throughout for playback, for seeking and for showing the timeline.

X11

I see some tearing of the video during playback. How can I fix it?

This is likely an issue with your configuration of your graphics card. For NVidia graphic cards, you can fix it by:
- Edit /etc/X11/xorg.conf with sudo permissions.
- Go to the “Device” section of your NVIDIA graphics card.
- Add or modify:
  Option "TripleBuffer" "True" Option "SwapInterval" "1"

Wayland

My playback is too slow. How can I improve it?

Check that you have:
- Help->About
  - Go to the HW tab.
    
    Check the GPU information and make sure that Vendor/Renderer is not Mesa, but the appropriate for your graphics card. For example:
    
    Vendor: NVIDIA Corporation Renderer: NVIDIA GeForce RTX 3080/PCIe/SSE2 Version: 4.6.0 NVIDIA 535.171.04
    
    Max. Texture Size:32768 x 32768
    
    If it is using Mesa, you may need to configure XWayland/Wayland correctly for your OS and graphics card. Or use mrv2 not on Wayland but on XWayland.
    
    If you run into that, use XWayland or log in onto X11. To use XWayland, set:
    
    export FLTK_BACKEND=x11
When I have a long floating panel, like the Media Information Panel, I can drag them out of the screen, and cannot repositiong them.

You can use ALT + F7 to reposition it.

Windows

After an install with file associations all icons appear with the mrv2 logo. How can I display the picture thumbnails once again?
- It is a bug in Windows, but it can be worked around. You manually should select one file extension that you want thumbnails for and select:
```
Open with->Choose another app
```
  Then select “Photos” from the menu and “Always”. This will restore the thumbnail, but it will remove the association to mrv2. To once again associate mrv2 to the file, go again to:
```
Open with->Choose another app
```
  But this time select “mrv2 Media Player Latest” and “Always”. This will associate mrv2 back to the file, but leave the thumbnails. You will see a small icon of mrv2 on the right bottom corner of the thumbnail.